108 BRITISH TUNICATA. 



a few specimens sent to me from Plymouth by Mr. 

 Spence Bate, and more recently several others from 

 Lulworth Cove, Dorsetshire, by Mr. Gwyn Jeffreys. 

 In its contracted state C. mamillaris is a very uncouth- 

 looking mass, and would scarcely be recognized as an 

 animal except by the practised eye of a naturalist; 

 in that state the" apertures being generally concealed 

 by the prominent lobes of the test, and the surface 

 much covered with small zoophytes and algae. It was 

 from this latter circumstance no doubt that Pallas 

 described it as irregularly clothed with soft hairs. 

 Modiola marnwrata is frequently found imbedded in 

 the test, and fragments of shells and stones often 

 adhere to the root-like prolongations of the base, and 

 occasionally also to the surface of the test. 



May not this be the species alluded to by Forbes 

 under the name of Cynthia microcosmus, as occurring 

 on the south coast of England? 



5. Styela opalina (Alder). 

 (Fig. 63 in text.) 



Cyntlna opalina ALDER in Ann. Nat. Hist, (3), XI [1863], 

 p. 164. 



Body transversely ovate, strongly but irregularly 

 mamiliated, opaline white, attached by a broad base. 

 Apertures not far apart, rather large, the branchial 

 placed not far from the anterior end. Test (fig. 63) 

 thick, smooth, white, semi-transparent, adhering 

 strongly to the mantle throughout. Mantle opaque 

 white, with one or two blotches of red near the aper- 

 tures. Tentacular filaments linear (?). Branchial sac 

 with four folds on' each side (?), oral lamina smooth, 

 inconspicuous. 



Breadth about three-quarters of an inch ; height one- 

 third less, rising a little towards the anterior end.* 



* Alder in 'Ann. Xat. Hist.' (3), XI, p. 164. [The "breadth" of the 

 " large specimen " figured by Mr. Hancock (fig. 63) was less than half an 

 inch, the " height " one-third of an inch.] 



